Blind-fastener.



E'rrEn STATES PATENT O FFIGE.

BLlND-FASTEN ER.

Specification of Letters Patent.

Patented. May 14, 1907.

Application filed M y 1,1906. Serial No. 314,716.

following is a specification.

The invention is in that class in which a segment secured to the building concentric to the hinge of a blind, door, or gate is engaged by means carried on such swinging member,

and the object of the invention is to provide simple, inexpensive, and efficient means for thus holding the swinging member either fully open or closed or in any intermediate angular position.

The invention consists in certain novel arrangements of parts and details of construction by which. the above objects are attained, to be hereinafter described.

The accompanying drawings form apart of this specification and show the invention applied to wind ow-blinds or shutters.

Figure 1 is an exterior elevation of the lower portion of a window equipped with the invention, one leaf of the blinds being closed and the other in the fully open position. Fig. 2 is a corresponding plan View partly in horizontal section. The remaining figures are on a larger scale and show details. Fig. 3 is an elevation showing the engaging means for the segment, the latter being in vertical section. Fig. 4 is a corresponding plan view. Fig. 5 is a plan view of the inner end of the segment, and Fig. 6 is a horizontal section showing the adjustable fastening for the outer end.

Similar letters of reference indicate the same parts in all the figures.

Ais the wall of a building, and A a windowsill for a window therein.

B B are the blinds of any ordinary or approved construction supported by hinges B B on the exterior of the wall and arranged to swing as usual.

D D are rods preferably circular in cross section bent to semicircular form, serving as the segments and having straight tangentially-extending ends D D secured at its inner end each .to the sill and at the outer end D to the exterior face of the building, with the center of the curve coincident with the axis of its hinge and blind; the latter is providedwith a notch b in its lower edge in which the rod or segment is received.

in such position.

C is a plate secured to theinner face of the blmd and having a notch or opening 0 extending acrossthe notch b, and with the latter inclosing the segment. On the plate 0 above the segment is a cam E eccentrically mounted and having an operating lever E which preferably lies approximately horizontally when the cam is in engagement with the segment, and extends toward the hinge when Thus conditioned the partial revolution of the cam releases the segment and permits the blind to be swung freely, and by reversing the movement the cam will pinch the segment between the circular face of the cam and the portion 0 of the plate below the segment and firmly hold the blind in any desired position within the limits of its swing.

The inner end of the segment is flattened and perforated to receive screws D by which it is secured to the window-sill, and the outer end D is screw-threaded, as shown, and received in a boss F on a plate F adapted to be secured to the outer face of the building. The threaded boss F permits the end D of the segment to extend therein as far as may be necessary in locating the segment concentrically to the hinge, any excess of length being received in a hole (1 provided in the wall of the building and covered by the plate F, or, the excess length may be out off if preferred. This adjustment of the outer end of the segment, with the inner end adapted for fastening to the sill at the proper point, permits the concentric position of the segment to be easily determined and the segment securely fastened when thus located.

By extending the arm C of the plate C across the notch b the blind is held against accidental removal from its hinges, and by arranging the cam E above the segment the latter is firmly grasped between the curved face of the cam and the arm 0.

The weight of the lever E when the cam is engaged tends to increase the friction of such engagement and therefore the vibrations of the blind due to wind or other cause, tightens the grip of the cam on the segment, and by extending the lever E toward the hinge-side of the blind it is conveniently presented for operation through the open window.

Although I have described the invention as applied to Window-blinds it will be understood that it will serve with doors, gates, transoms, and analogous closing means, and

the notch therein for the accommodation of the segment may be above or belowor at either end as conditions may require.

Other modifications may be made in the forms and proportions of the parts, in the adjusting device for the outer end of the segment, and in the engaging means therefor on the swinging member.

The inner end of the segmental rod may be fastened to the sill or other fixed portion adjacent to the window by other means than that shown and described.

1. In a blind-fastener, a segmental rod constructed to be fixed to a building concentrically to the hinge of the blind, a notch in the latter receiving said rod, and a cam carried by said blind and arranged to directly engage frictionally with said rod.

' 2. In a blind-fastener, a segmental red constructed to be fixed to a building concentrically to the hinge of the blind, a notch in the latter receiving said rod, a plate secured to said blind and having a portion extending across said notch to inelose said rod, and a cam mounted on said plat and constructed to directly engage irictionally with said rod when turned in one direction and to release said red by a movement in the opposite direction 3. In a blind-fastener, a segmental rod one end of which is constructed to be secured to a window-sill, and the other end sere\\"threaded, a plate constructed to be fastened to a wall of a building and having an open-ended screw-threaded opening therein matching 

